Stuff

smtpd_helo_restrictions = permit
smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, warn_if_reject, reject_non_fqdn_sender, permit
smtpd_client_restrictions = permit_sasl_authenticated, permit_mynetworks
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_unauth_destination, permit
smtpd_data_restrictions = reject_unauth_pipelining

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Aug 15 10:59:47 kirby postfix/smtpd[12359]: 8F82F18420F: reject: RCPT from unknown[216.248.56.222]: 554 <ltsimpson@insightbb.com>: Relay access denied; from=<veronica@kbcint.com> to=<ltsimpson@insightbb.com> proto=ESMTP helo=<Veronica>